The LIFE-DCY research project has two aims. First, to evaluate disabled children’s quality of life (QoL) as reported by themselves and their parents, and second, to locate commonalities, differences, and conflicting issues in the processes that may influence disabled children’s life quality and participation. This paper describes the study design, methodology, and methods along with lessons learned. In addition various methodological and ethical concerns are raised. A sequential mixed-methods design was applied. In Phase one (mapping) we used KIDSCREEN-27 to study how disabled children evaluate their QoL compared with the perspectives of their parents and those of non-disabled children and their parents. Using the Participation and environment measure we also studied parents’ perspectives of their children’s participation in different social contexts. Altogether 209 disabled children and their parents, and 335 children in a control group and their parents (paired reports) participated in phase one. Phase two (unpacking) consisted of 14 case studies with disabled children aged 8–18 years and focus groups with 21 disabled people aged 19–35 years. The initial analysis was inductive and data-oriented. We then used critical and transformative lenses to shed light on how meaning was made of life quality and participation in relation to the context in which study participants found themselves. The LIFE-DCY research promotes an understanding of how important aspects of life quality and participation may intersect within different contexts and at different times. The theoretical understandings from this study may also help unpack various aspects of childhood disability in terms of knowledge and power and enhance understandings of how ideas about normality and childhood disability are constructed.